body{
    font: 400 1em / 1.5em 'Source Sans Pro', sans-serif;
    color: #595B66;
}
.fl{
    float: left;
}
.fr{
    float: right;
}
.mask{
	position: fixed;
    width: 100%;
    height: 100%;
    left: 0;
    top: 0;
    background-color: #000;
    opacity: .5;
    z-index: 1199;
}